scholarly journals Enhanced light emission of quantum dot films by scattering of poly(zinc methacrylate) coating CdZnSeS/ZnS quantum dots and high refractive index BaTiO3 nanoparticles

RSC Advances ◽  
2020 ◽  
Vol 10 (53) ◽  
pp. 31705-31710
Author(s):  
Hongcheng Yang ◽  
Miao Zhou ◽  
Haodong Tang ◽  
Mingyu Sun ◽  
Pai Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Refractive Index ◽  
Quantum Dot ◽  
Light Emission ◽  
High Refractive Index ◽  
Scattering Coefficient ◽  
Batio3 Nanoparticles

We report QD films based on a poly(zinc methacrylate) coating with alloyed green-emitting CdZnSeS/ZnS quantum dots (QDs@PZnMA) together with high refractive-index BaTiO3 nanoparticles to enhance the scattering coefficient of the QD films.

Photochromic control of a plasmon–quantum dots coupled system

Nanoscale ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 258-265 ◽  
Author(s):  
Gwénaëlle Lamri ◽  
Artur Movsesyan ◽  
Edite Figueiras ◽  
Jana B. Nieder ◽  
Jean Aubard ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Light Emission ◽  
Coupled System ◽  
System P

The enhancement and the control of quantum dot (QD) light emission is a challenge for many applications.

Cavity Design and Optimization of Hybrid Quantum Dot Organic Light Emitting Devices for Blue Light Emission

2020 ◽  
Vol 15 (11) ◽  
pp. 1364-1373
Author(s):  
Iman E. Shaaban ◽  
Ahmed S. Samra ◽  
Bedir Yousif ◽  
N. A. Alghamdi ◽  
Shamia El-Sherbiny ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Blue Light ◽  
Light Emission ◽  
Cdse Qds ◽  
Blue Light Emission ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

The present search handles the blue light emission investigation of hybrid quantum dots organic light-emitting devices. The emissions at 445 nm and 460 nm have been examined for microcavity hybrid quantum dot organic light-emitting devices (QD-OLED) upon quantum dots of CdS and CdSe. External light emissions have been evaluated through a numerical model based on the transfer matrix for electromagnetic plane waves. The devices' optical properties are investigated based on internal reflectance and cavity length by considering the architecture consisting of multilayers thin-film structures. The overall performance of the light-emitting devices with emission at 445 nm showed an improvement of the enhancement factor and narrowing outcoupling emission relative to the devices with emission at 460 nm. Besides, the light-emitting devices based on CdS QDs revealed better performance relative to the devices based on CdSe QDs.

A new route toward light emission from Ge: tensile-strained quantum dots

Nanoscale ◽  
2015 ◽  
Vol 7 (19) ◽  
pp. 8725-8730 ◽  
Author(s):  
Qimiao Chen ◽  
Yuxin Song ◽  
Kai Wang ◽  
Li Yue ◽  
Pengfei Lu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Light Emission ◽  
Ge Quantum Dot

Tensile strained Ge quantum dot will be a promising new light emission material.

Improving the luminescence performance of quantum dot-based photonic crystals for white-light emission

2016 ◽  
Vol 4 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Heng Li ◽  
Zhaohua Xu ◽  
Bin Bao ◽  
Ning Sun ◽  
Yanlin Song
Keyword(s):  
Quantum Dots ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Quantum Dot ◽  
Crystal Structures ◽  
White Light ◽  
Light Emission ◽  
White Light Emission ◽  
Bright White Light ◽  
Luminescence Performance

A very bright white light was obtained by combining the advantages of red, green and blue quantum dots with photonic crystal structures.

scholarly journals Strong coupling of single quantum dots with low-refractive-index/high-refractive-index materials at room temperature

2020 ◽  
Vol 6 (47) ◽  
pp. eabb3095
Author(s):  
Xingsheng Xu ◽  
Siyue Jin
Keyword(s):  
Quantum Dots ◽  
Refractive Index ◽  
Strong Coupling ◽  
Room Temperature ◽  
High Refractive Index ◽  
Colloidal Quantum Dots ◽  
Rabi Splitting ◽  
Pl Spectra ◽  
Dielectric Cavity ◽  
Low Refractive Index

Strong coupling between a cavity and transition dipole moments in emitters leads to vacuum Rabi splitting. Researchers have not reported strong coupling between a single emitter and a dielectric cavity at room temperature until now. In this study, we investigated the photoluminescence (PL) spectra of colloidal quantum dots on the surface of a SiO2/Si material at various collection angles at room temperature. We measured the corresponding reflection spectra for the SiO2/Si material and compared them with the PL spectra. We observed PL spectral splitting and regarded it as strong coupling between colloidal quantum dots and the SiO2/Si material. Upper polaritons and lower polaritons exhibited anticrossing behavior. We observed Rabi splitting from single-photon emission in the dielectric cavity at room temperature. Through analysis, we attributed the Rabi splitting to strong coupling between quantum dots and bound states in the continuum in the low-refractive-index/high-refractive-index hybrid material.

scholarly journals Nanoimprinted High-Refractive Index Active Photonic Nanostructures Based on Quantum Dots for Visible Light

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Carlos Pina-Hernandez ◽  
Alexander Koshelev ◽  
Scott Dhuey ◽  
Simone Sassolini ◽  
Michela Sainato ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Refractive Index ◽  
Visible Light ◽  
High Refractive Index

scholarly journals Plasmon-Enhanced Blue-Light Emission of Stable Perovskite Quantum Dot Membranes

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 770 ◽  
Author(s):  
Kai Gu ◽  
Hongshang Peng ◽  
Siwei Hua ◽  
Yusong Qu ◽  
Di Yang
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Blue Light ◽  
Polyvinylidene Fluoride ◽  
Fluorescence Enhancement ◽  
Light Emission ◽  
Electrospun Nanofibers ◽  
Layer By Layer ◽  
Blue Light Emission ◽  
Molecular Group

A series of stable and color-tunable MAPbBr3−xClx quantum dot membranes were fabricated via a cost-efficient high-throughput technology. MAPbBr3−xClx quantum dots grown in-situ in polyvinylidene fluoride electrospun nanofibers exhibit extraordinary stability. As polyvinylidene fluoride can prevent the molecular group MA+ from aggregating, MAPbBr3−xClx quantum dots are several nanometers and monodisperse in polyvinylidene fluoride fiber. As-prepared MAPbBr3−xClx quantum dot membranes exhibit the variable luminous color by controlling the Cl− content of MAPbBr3−xClx quantum dots. To improve blue-light emission efficiency, we successfully introduced Ag nanoparticle nanofibers into MAPbBr1.2Cl1.8 quantum dot membranes via layer-by-layer electrospinning and obtained ~4.8 folds fluorescence enhancement for one unit. Furthermore, the originality explanation for the fluorescence enhancement of MAPbBr3−xClx quantum dots is proposed based on simulating optical field distribution of the research system.

The Study of Optical Properties as Glass Composition of Bi2O3-Based Glass/Phosphor Mixed Paste

2015 ◽  
Vol 15 (10) ◽  
pp. 7657-7663 ◽  
Author(s):  
M. K. Hwang ◽  
I. G. Kim ◽  
Y. K. Jung ◽  
B. K. Ryu
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Light Emission ◽  
Glass Composition ◽  
High Refractive Index ◽  
Fast Response ◽  
Glass Frit ◽  
Characteristic Change ◽  
Emission Characteristic ◽  
The Difference

Recently, White light emitting diodes (WLEDs) have been studied because of many advantages such as lower energy consumption, fast response, high brightness. Glass frit has been interested in LED packages due to their superior properties such as long-term stability and permeability. To maximize the LED light emission characteristic, the glass frit was required a low firing temperature and high refractive index. We selected the bismuth-based glass due to their low melting and high refractive index. This study was investigated characteristics of glass according to the influence of the glass within Bi2O3 content and this glass characteristic change was studied the effects on the optical properties of LED package structure. The properties changes of the glass frit affect the optical property of the mixed paste. With higher contents of Bi2O3 glass composition, the transmittance and emission intensity of the mixed paste was increased. These results suggest that the difference in refractive index between the phosphor and glass frit is minimized, the loss of light is minimized.

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